Composition for preventing set-offs in printing.



UNITED sTA rns" PATENT oruuon.

GEOM H 1 STEELE DUNCAN AND GEORGE HENRY POTTS, OF EDINBURGH, SCOTLAND, ASSlUNOltS TO AMERiCAN OFFSET COMPANY, OF NEW YORK, N. Y., A UORPORA'ilON OF NEW YORK.

COMPOSITION FOR PREVENTlNG SET-OFFS lN PFllNTlNG.

Original application filed my B, i905 Serial N6. 259,374. Divided and thisap'plication filed Fehrnaryfi,1906. Serial No. BQQuEl'i.

To all whom if 11m, concern;

Be it known that we, Gannon STEELE DUNCAN and Gnonon HENRY Prrr'rs, subects of the King of Great Britain, residing at Idinburgh, Scotland, have invented an improvement in compositions for Preventing Set-Oil in Printing, of which the follom'ng is a specification.

This invention has for its object to provide an improved composition to prevent setofl' or transfer of ink from one sheet to another or from one side to the reverse side of a. sheet in printing, the said composition being particularly applicable for use in rotary printing-presses, rotary presses for magazine printing, perfectin -machines, and flatbed sin le-cylinder mac incs.

fhis invention in its preferred embodiment consists of a liquid composition which is particularly designed to be used for dam pening the set-ofl rollers of printing-presses,- althou h it is adapted for use in any manner for which anti-set-ofl" compositions are or may be used.

The composition com rises in its preferred embodiment soap, (pre erably soft soap) a resinous substance, (preferab y turpentine) anon-volatile oil, (preferably a non-drying oil, such as oliveoil,) a non-volatile oxidizing oil, (preferably boiled linseed-0H,} a stable lubricating-oil, (preferably neats-foot oil,) a highly-volatile mineral solvent, (preferably no htha,) and an organic solvent, (preferab y methylated spirits.)

The proportions in which we prefer to mix the above-named ingredients are as follows: equal volumes of each of the oils-that is to say, e ual volumes of neats-foot oil and boiled linsee -oilande ualvolumes of methylated s irits and napht a, the volume of each of t ese being about half thelvolume of the boiled linseed-oil. The volume of the turentine is preferably kept a little less than lialf thevolume. of the boiled linseed-oil. The soap should be 1present in the proportion of about one poem to every four quarts-of tur entine.

lo the in redients and pro ortions above given are 51086 which are pre erred, it is to be understood that this invention is not limited thereto, as the proportions ma be varied Within Wide limits and certain o the Specification of Letters Patent to say, one ma r Patented July 10, 1906.

ingredient-s omitted and equivalents of the ingredients substituted in their place.

The invention is to be considered asbroadly embracing theieatures of novelty in acomposition for the purpose specified as defined within the scope of the ap ended. claims.

Among the changes wiich may be made in this composition Without departin from the spirit of the invention or material y sacrificing the advantages thereof may be mentioned the following, which are, however, to

be considered as merely illustrating a few of the many changes which the skill and experience of workers in the art will naturally suggest. The neats-foot oil and the oliveoil are practically interehan eablc that is c more or less completely replaced by t e other. in place of the naphtha, benzene or other similar volatile solvent may be used; but na htha is reierred. The report-ion ofboi ed linsee oil may be wide y varied; but the best results have been obtained when the proportion of this ingredient is not diminished or increased by more than one-third of the roportions indicated above. The roportlon of the methylated spirits or nap tha, or of both of these, may be very considerably increased without seriously affecting the character of the li uid, and the proportlon of the naphtha may e materially diminished Without impairing the usefulness of the liquid. The proportions of the soap may be materially varied, and where the com osition is to be used with rotary machines it can be advantageously materially increased. Where the proportion of the soap is increased, it has con found that the best results are obtained by correspondingly increasing the proportion o the naphtha. I

In preparing the com osition, as it is desirable to apply heat to ring about as good an admixture of the soap as possible it is preferable to defer adding the naphtha until after this heating and to take only one-third of the total volume of the liquid previous to the addition of the naphtha and to this third add the soap and stir well, graduall raising the temperature to about 136 Fa enheit. Then turn off the heat and allow the liquid to cool under gentle stirring. When the liquid is cool, add to it the remaining two-thirds, to

which in. the meantin'le naphtha has been added.

The liquid is preferably applied by a cloth saturated with it and the principal lubricating-roller thereby given a good soaking. The frequency of the applications of the liquid for a given quantity of work depends largely on the quality of the ink. ith a rotary machine if good ink is used the initial dam pening will sullice during the running of the reel, whereas with inferior ink the same machine and the same work may require a further application of the liquid when only half the reel is run.

In another application for Letters Patent, filed May 8, 1905, Serial No, 259,374, of which this is a division, we have described the composition hereil'lbelore set forth. and have claimed certain novel features thereof not hereinafter claimed.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. A composition for preventing set-oft, com nising a resinous liquid and soap.

2. A composition for preventing set-oil, comprising turpentine and soap.

3. A composition for preventing set-off, comprising a resinous liquid, soap and a vol atile solvent.

4. A composition for preventing set-oft, comprising turpentine, soap and a volatile solvent.

5. A composition for preventing set-off, comprising a resinous liquid, soap, a volatile solvent and an oxidizing-oil.

6. A composition for preventing set-off, comprising a resinousliquid, soap, a volatile solvent and linseed-oil.

7. A composition for preventing set-oil, comprising turpentine, soap, a volatile solvent and linseed-oil.

8. A composition for preventing set-oil, comprising a resinous liquid, soap, a volatile solvent, an oxidizingoil and a. stable lubrieating-oil.

9. A composition for preventing set-oil," comprising a resinous substance, soap, a volatile solvent, an oxidizing-oil and neats-foot oil.

10. A composition for preventing set-oil, comprising turpentine, soap, a volatile mineral solvent, boiled linseed-oil and neats-foot oil.

1 1. A composition for preventing setoll', comprising a resinous liquid, soap, a volatile mineral solvent, an oxidizing-oil, a stable lubricating-oil and an organic solvent.

12. A composition for preventing set-off, comprising a resinous liquid, soap, a volatile mineral solvent, an OXidlZiIlg-Oil, a stable lubricating-oil and methylated spirits.

13. A composition for preventing set-oil, comprising turpentine, soap, a volatile mineral solvent, boiled linseed-oil, neats-foot oil and methylated spirits in substantially the proportions specified.

In testimony whereof weafiix our signatures in presence of two witnesses.

GEORGE STEELE DUNCAN. GEORGE HENRY POTTS.

GEORGE G. SGI'IOE'NLANK, W. H. BERRIGAN. 

